Just swapped a ford 8 inch for a ford 9 inch rearend. I also installed 17x7 rims with 225/50 firestone firehawks tires. The rear fender edge keeps cutting into the tires when i hit a bump or dip in the road. The stock bump stops in the frame are about 8 to 10 inches away from rear end. How do i stop it from cutting into my tire.